A-site deficiency effects on the structure, magnetic and transport properties of Pr0.6−x□xSr0.4MnO3 (0≤x≤0.2) perovskite manganite

Room temperature magnetocaloric and magneto-transport properties of monovalent doped Pr 0.6 Sr 0.35 Na 0.05 MnO 3 manganite

“…The shift of T toward higher temperatures reveals that the applied raising magnetic field involves the electron delocalization effects. It is worth to notice that T is remarkably lower than the Curie temperature T C = 300 K. The similar behavior of T has been also reported for praseodymium deficient Pr 0.6−x x Sr 0.4 MnO 3 [33] and other doped manganites [34]. These differences can be related to the small grain sizes, which perturb the surface layer.…”

Structural and magnetic properties of self-doped perovskite manganites La0.8-xSr0.2MnO3−δ

“…11 For instance, Dhahri et al 13 concluded that 2 mol Mn 3þ ions change into Mn 4þ ions when 1 mol of Sr 2þ ions were substituted by vacancies in the manganites La 0.8 Sr 0.2Àx MnO 3Àd . In a similar vein, Koubaa et al 14 concluded that the Mn 4þ ion content increased from 55% to 100% as the self-doped level, x, increased from 0.05 to 0.20 in the manganites Pr 0.6Àx Sr 0.4 MnO 3Àd . On the contrary, Dezanneau et al 12 prepared nanocrystalline compounds of La 1Àx MnO 36d , and investigated structural and magnetic properties of the materials.…”

“…[9][10][11] One of the basic physical problems is whether there are vacancies at the A sites in ABO 3 self-doped perovskite manganites. So far, most studies have focused on vacancy doping in Ln 1Àx M x MnO 3 compounds, [12][13][14] and they have all supposed that there are vacancies at the A sites. However, these studies were not in agreement regarding the dependences on the self-doping level x of Mn 4þ ion content ratio, R M4 , at the B sites, resulting to be not in agreement for the dependences of the Curie temperature T C on R M4.…”

The effect of strontium deficiency in Pr0.6Sr0.4MnO3 perovskite manganites

“…All samples exhibit a paramagnetic to ferromagnetic transition with decreasing temperature. It should be noted that the magnetization decrease at low temperature observed in praseodymium-deficient samples Pr 0.6−x x Sr 0.4 MnO 3 (0 ≤ x ≤ 0.15) (related to the coexistence, at low temperature, of two phases: an orthorhombic phase with Pnma space group and a monoclinic one with I2/a space group) has not been detected in our strontium deficient compounds [27,28]. Fig.…”